I keep having this error where, upon reopening the project, some of the envelopes are offset from where they are supposed to be.

https://c2.staticflickr.com/8/7469/16012815641_d95a646d37_m.jpg
https://c2.staticflickr.com/8/7526/16014084892_edc359d4b5_m.jpg

Here are two examples from the project I just opened.

Is there any way to prevent this or fix it?

I am using Sony Vegas Movie Studio 11 platinum.